The Long Drag is a slang term which refers to an event that marks the culmination of the Fitness and Navigation phase of UK Special Forces Selection and the Pathfinder Platoon cadre[citation needed]. The event, also known simply as Endurance, involves a 64 kilometre (40 mile) long distance march over the Brecon Beacons of Wales. Candidates shoulder a Bergen backpack that weighs 25 kilogrammes (not including water, food and rifle) and they must complete the route in less than twenty hours. Candidates are prohibited from using established trails and all navigation must be performed by map, compass and memorised grid references. The event is especially demanding because it comes at the end of an intense four weeks of marches and runs.